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            <ol class="post-toc"><li class="post-toc-item post-toc-level-2"><a class="post-toc-link" href="#学习笔记-详解JDK-10中的新特性"><span class="post-toc-number">1.</span> <span class="post-toc-text">学习笔记 : 详解JDK 10中的新特性</span></a><ol class="post-toc-child"><li class="post-toc-item post-toc-level-3"><a class="post-toc-link" href="#局部变量类型推断"><span class="post-toc-number">1.1.</span> <span class="post-toc-text">局部变量类型推断</span></a><ol class="post-toc-child"><li class="post-toc-item post-toc-level-4"><a class="post-toc-link" href="#前言"><span class="post-toc-number">1.1.1.</span> <span class="post-toc-text">前言</span></a></li><li class="post-toc-item post-toc-level-4"><a class="post-toc-link" href="#简介"><span class="post-toc-number">1.1.2.</span> <span class="post-toc-text">简介</span></a></li><li class="post-toc-item post-toc-level-4"><a class="post-toc-link" href="#示例"><span class="post-toc-number">1.1.3.</span> <span class="post-toc-text">示例</span></a></li><li class="post-toc-item post-toc-level-4"><a class="post-toc-link" href="#注意"><span class="post-toc-number">1.1.4.</span> <span class="post-toc-text">注意</span></a></li></ol></li></ol></li></ol>
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        <h1 class="post-card-title">详解JDK 10中的新特性</h1>
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            <time class="post-time" title="2019-08-21 16:49:44" datetime="2019-08-21T16:49:44.000Z"  itemprop="datePublished">2019-08-21</time>

            


            

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            <h2 id="学习笔记-详解JDK-10中的新特性"><a href="#学习笔记-详解JDK-10中的新特性" class="headerlink" title="学习笔记 : 详解JDK 10中的新特性"></a>学习笔记 : 详解JDK 10中的新特性</h2><p><em>2018年3月21日,Oracle官方宣布 Java10 正式发布. 需要注意的是 Java9 和 Java19 都不是 LTS( Long-Term-Support )版本,和过去的 Java 大版本升级不同,这两个只有两年半左右的开发和维护期. 而 Java11,也就是18.9LTS,才是继 Java8 之后的第一个 LTS 版本. JDK10 中一共定义了109个新特性,其中包含12个 JEP,还有一些新 API 和 JVM 规范以及 Java 语言规范上的改动,JDK10 的12个 JEP( JDK Enhancement Proposal 特性加强提议 )如下所示,更多信息请参阅官方文档 : <a href="http://openjdk.java.net/projects/jdk/10/" target="_blank" rel="noopener">http://openjdk.java.net/projects/jdk/10/</a></em></p>
<ol>
<li>Local-Variable Type Inference (<code>主要重点:局部变量类型推断</code>)</li>
<li>Consolidate the JDK Forest into a Single Repository (JDK库的合并)</li>
<li>Garbage-Collector Interface (统一的垃圾回收接口)</li>
<li>Parallel Full GC for G1 (为G1提供并行的Full GC)</li>
<li>Application Class-Data Sharing (应用程序类数据( AppCDS )共享)</li>
<li>Thread-Local Handshakes (threadLocal握手交互)</li>
<li>Remove the Native-Header Generation Tool (javah) (移除JDK中附带的javah工具)</li>
<li>Additional Unicode Language-Tag Extensions (使用附加的Unicode语言标记扩展)</li>
<li>Heap Allocation on Alternative Memory Devices (在可选内存设备上进行堆分配)</li>
<li>Experimental Java-Based JIT Compiler (使用基于Java的JIT编译器)</li>
<li>Root Certificates (根证书)</li>
<li>Time-Based Release Versioning (基于时间的发布版本)</li>
</ol>
<h3 id="局部变量类型推断"><a href="#局部变量类型推断" class="headerlink" title="局部变量类型推断"></a>局部变量类型推断</h3><h4 id="前言"><a href="#前言" class="headerlink" title="前言"></a>前言</h4><p><em>很多人抱怨 Java 是一种强类型,需要引入大量的样板代码. 甚至在这些情况下,给定好变量名,通常很清楚发生了什么,明显类型声明往往被认为是不必要的. 许多流行的编程语言都已经支持某种形式的局部变量类型推断 : 如C++ (auto), C# (var), Scala (var/val), Go (declaration with :=)等</em></p>
<h4 id="简介"><a href="#简介" class="headerlink" title="简介"></a>简介</h4><p><em>Java 局部变量类型推断( LVTI ),JDK10 中可以使用 var 作为局部变量类型推断标识符,<code>此符号仅适用于局部变量,增强for循环的索引,以及传统for循环的本地变量. 它不能使用于方法形式参数,构造函数形式参数,方法返回类型,字段,catch块形式参数或任何其他类型的变量声明</code>. 标识符 var 不是关键字,相反,它是一个保留的类型名称. 这意味着 var 用作变量,方法名或则包名称的代码不会受到影响. 但 var 不能作为类或则接口的名字( 但这样命名是比较罕见的,因为他违反了通常的命名约定,类和接口首字母应该大写 ). <code>其工作原理为 : 在处理 var 时,编译器先是查看表达式右边部分,并根据右边变量值的类型进行推断,作为左边变量的类型,然后将该类型写入字符码当中</code></em></p>
<h4 id="示例"><a href="#示例" class="headerlink" title="示例"></a>示例</h4><p><em>类型推断代码示例 :</em><br><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">var</span> str = <span class="string">"ABC"</span>; <span class="comment">//根据推断为字符串类型</span></span><br><span class="line"><span class="keyword">var</span> l = <span class="number">10L</span>; <span class="comment">//根据10L推断为long类型</span></span><br><span class="line"><span class="keyword">var</span> flag = <span class="keyword">true</span>; <span class="comment">//根据true推断为boolean类型</span></span><br><span class="line"><span class="keyword">var</span> flag1 = <span class="number">1</span>; <span class="comment">//这里会推断boolean类型,0表示false非0表示true</span></span><br><span class="line"><span class="keyword">var</span> list = <span class="keyword">new</span> ArrayList&lt;String&gt;(); <span class="comment">//推断为ArrayList&lt;String&gt;</span></span><br><span class="line"><span class="keyword">var</span> stream = list.stream(); <span class="comment">//推断为Stream&lt;String&gt;</span></span><br></pre></td></tr></table></figure></p>
<p><em>上述示例代码的反编译class文件 :</em><br><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line">String str = <span class="string">"ABC"</span>;</span><br><span class="line"><span class="keyword">long</span> l = <span class="number">10L</span>;</span><br><span class="line"><span class="keyword">boolean</span> flag = <span class="keyword">true</span>;</span><br><span class="line"><span class="keyword">int</span> flag1 = <span class="keyword">true</span>;</span><br><span class="line">ArrayList&lt;String&gt; list = <span class="keyword">new</span> ArrayList();</span><br><span class="line">Stream&lt;String&gt; stream = list.stream();</span><br></pre></td></tr></table></figure></p>
<p><em>遍历代码中使用类型推断 :</em><br><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//集合遍历</span></span><br><span class="line"><span class="keyword">var</span> list = <span class="keyword">new</span> ArrayList&lt;String&gt;();</span><br><span class="line"><span class="keyword">for</span> (<span class="keyword">var</span> s : list) &#123; &#125;</span><br><span class="line"><span class="comment">//普通遍历</span></span><br><span class="line"><span class="keyword">for</span> (<span class="keyword">var</span> i = <span class="number">1</span>; i &lt; <span class="number">10</span>; i++) &#123; &#125;</span><br></pre></td></tr></table></figure></p>
<p><em>var 类型可以被final修饰符修饰</em><br><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">final</span> <span class="keyword">int</span> limit = <span class="number">10</span>;</span><br></pre></td></tr></table></figure></p>
<h4 id="注意"><a href="#注意" class="headerlink" title="注意"></a>注意</h4><p><em>在局部变量使用中,这些情况不适用类型推断哟 : <code>没有初始化的局部变量声明</code>, <code>方法的返回类型</code>, <code>方法的参数类型</code>, <code>构造器的参数类型</code>, <code>属性</code>, <code>catch块</code>. 部分示例如下所示</em></p>
<ol>
<li><p><em>初始值不能为null,既如果局部变量不赋值,则无法实现类型推断</em></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//error</span></span><br><span class="line"><span class="keyword">var</span> string1;</span><br><span class="line"><span class="keyword">var</span> string2 = <span class="keyword">null</span>;</span><br></pre></td></tr></table></figure>
</li>
<li><p><em>为数组静态初始化中,语法格式需要注意</em></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">int</span>[] array = &#123;<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>&#125;; <span class="comment">//正确写法</span></span><br><span class="line"><span class="keyword">var</span> array2 = <span class="keyword">new</span> <span class="keyword">int</span>[]&#123;<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>&#125;; <span class="comment">//正确写法</span></span><br><span class="line"><span class="keyword">var</span> array3 = &#123;<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>&#125;; <span class="comment">//错误写法</span></span><br></pre></td></tr></table></figure>
</li>
<li><p><em>Lambda表达式及方法引用中,左边的函数式接口不能声明为 var</em></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//正确写法</span></span><br><span class="line">Comparator&lt;Integer&gt; comparator = (o1, o2) -&gt; Integer.compare(o1, o2);</span><br><span class="line"><span class="comment">//错误写法</span></span><br><span class="line"><span class="keyword">var</span> comparator = (o1, o2) -&gt; Integer.compare(o1, o2);</span><br><span class="line"></span><br><span class="line"><span class="comment">//正确写法</span></span><br><span class="line">Consumer&lt;String&gt; consumer = System.out::println;</span><br><span class="line"><span class="comment">//错误写法</span></span><br><span class="line"><span class="keyword">var</span> consumer = System.out::println;</span><br></pre></td></tr></table></figure>
</li>
</ol>
<p><em>更多 JDK10 的新特性描述请参阅 : <a href="http://openjdk.java.net/projects/jdk/10/" target="_blank" rel="noopener">官方文档</a></em></p>

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